It’s too late for criminal charges against Amy Bishop for the 1986 shooting of her brother, Seth, and the aftermath of the incident, the Norfolk District Attorney’s office said last night.

The conclusion was reached after a review of original police reports of the incident, which had been thought to be missing.

David Traub, a spokesman for Norfolk District Attorney William Keating, said the documents were reviewed by lawyers and investigators in the office. They found that “probable cause existed at that time to place Amy Bishop under arrest” for assault with a dangerous weapon, carrying a dangerous weapon and unlawful possession of ammunition.

“The statute of limitations has run on all of those charges,” Traub said.

Nothing in the reports contradicts the account given by Judy Bishop, Amy and Seth’s mother, that the shooting was accidental, Traub said.

“Even if a grand jury were to hear allegations that this incident involved wanton and reckless conduct on the part of Amy Bishop, the lowest standard for manslaughter in Massachusetts, the statute of limitations has barred indictment on those charges since 1992,” Traub said.